A new group has begun collecting signatures in support of a long-delayed proposal in the D.C. Council that targets one man who owns roughly half of the city’s gas stations.

The group, D.C./Mid Atlantic Affordable Gasoline Coalition, wants lower gas prices in the District, where prices average about 20- to 30-cents-per gallon more than in the Maryland or Virginia suburbs. Gas station operators who have to buy fuel from station owner Joe Mamo say Mamo is price gouging them, forcing them to charge more at the pump.